Skynyrd57

I would like to buy a keltec sub2000 in .40 mm. the .40 mm version is abailable with 2 different twist eates, 1:10 and 1:16. I have always favored velocity and accuracy. I would appreciate it if one of the experts would give me a rundown of performance with each of the twist rate and make a reccomendation. This will be my first pistol carbine and I want the most accurate bullet placement with each of these twist rates and some advice on bullet weight for the best results. thanks